What is the Fn Lock icon used for and how do you turn it off and on?

Confused by the Fn Lock icon on your keyboard? Discover its purpose, how it affects your keyboard, and the simple steps to enable or disable it on any PC.

Confused by the Fn Lock icon on your keyboard? Discover its purpose, how it affects your keyboard, and the simple steps to enable or disable it on any PC.<p><img src="https://www.engadget.com/img/gallery/what-is-the-fn-lock-icon-used-for-and-how-do-you-turn-it-off-and-on/intro-1794006613.jpg" /></p>